Meat and bone saw



Dec. 21, 19 9 NH. AHRNDT Em 2,492,82

HEAT AND BONE SAW Filed Jan. 5, 1945 7 Shets-Sheet l Dec. 27, 1949 A. H.AHRNDT EIAL MEAT AND BONE SAW Filed Jan. 5,19%

7 Sheets-Sheet 2 .lll l n. I?!

A. H. AHRNDT ET AL MEATAND BONE SAW Dec. 27, 1949 Fil ed Jan. 5, 1945 '7Sheets-Sheet 3 Dec. 27, 1949 v H. AHRNDT EI'AL. 2,492,824

HEAT AND BONE SAW Filed Jan. 5, 1945 7 Sheets-Sheet 4 I J22 g A. H.AHRNDT ET AL MEAT AND BONE SAW Dec. 27, 1949 Dec. 27, 1949 I A. H. .AHNDT' EI' AL. I 2,492,824

HEAT AND BONE sAw Sheets-Sheet 6 Filed Jan 5, 1945 @itented Dec. 2?, W49

MEAT AND BONE SAW Arthur H. Ahrndt, John G. Krenake, and HendrikStukart, La Porte, Ind., assignors to U. S. Slicin: Machine Company,Inc., a corporation of Indiana Application January 5, 1945, Serial No.571,398

4 Claims.

This invention relates-to a machine for sawing meat, bone, and fish, andany other substance which may be cut by a continuously operating saw.

An important object of the invention is the provision of a new and novelmeat, bone and fish saw which is compact and sturdy in construction,which is-eiiicient in operation, which is unlikely to get out of order,which is safe in operation, and which can be easily and readily cleaned.

A further object of the invention is the provision of a saw of the abovetype wherein the operation of the saw is controied by a foot pedalconveniently located at the front of the machine, which foot pedal notonly turns on and shuts off the electric motor but also operates acontrol switch for controlling a lighting element juxtaposed withrespect to the cutting surface of the saw, whereby a light may bedirected at an operative position on the substance.

A further object of the invention resides in the construction of asliding table having an adjustable body support for sliding the table.

A still further object of the invention resides in new and novel meansfor efiecting a flush substance surface comprising various table tops,interfltting but removable, so as to provide a smooth work surface andpermit the parts to be readily removed for cleaning or otherwise.

Still another object of the invention resides in novel mounting for thesaw pulleys to effect ready adjustment and to permit easy cleaning.

A still further object resides in the provision of a new and improved,easy sliding, adjustable end plate construction.

Still another object resides in the provision of slotted blade blockguides to provide guides and backing for the saw to maintain the saw inproper position to prevent buckling thereof, the blocks being removablefor cleaning purposes. I

Other objects of the invention reside in a hinged top door covering theupper blade section, permitting quick blade exchange or cleaning; ahinged lower right section for permitting quick removal of the blade andeasy cleaning thereof; a' convenient knob and indicator guide fortightening the blade to the proper tension; easy removal of variousparts, making it possible and convenient to get to all working parts foradjustment and replacement; the enclosure of all working parts; theadjustment of the belt to compensate for wear; the general arrangement,construction and location of the parts to effect a sturdy, eiiicientlyoperating device capable of 2 being disassembled for adjustment. wear,cleaning, etc.; and the provision of a guide element for the saw whichis adjustable to protect the operator from such part of the saw as isnot being actually employed for the cutting of the meat.

Numerous other objects and advantages will be apparent throughout theprogress of the following specification.

The accompanying drawings illustrate a selected embodiment of theinvention and the views therein are as follows:

Fig. 1 is a detail perspective view of the meat and bone saw of theinvention;

Fig. la, is a detail perspective view of part of the main table top andshowing the saw guide block in position;

Fig. 1b is a detail perspective view of the saw guide block shown inFig. 14:;

Fig. 1c is a detail plan view showing the saw guide block in position;

Fig. 2 is a detail right hand elevational view, some of the parts beingshown in open position;

Fig. 3 is a detail vertical sectional view looking from the left sidetoward the right side;

Fig. 4 is a detail vertical sectional view showing the extreme forwardend of the slidabie table;

F'gi. 5 is a detail vertical sectional view looking from the fronttoward the rear, the view being at right angles to Fig. 3;

Fig. 6 is a detail sectional view on the line H of Fig. 5;

Fig. '7 is a detail sectional view on the line i-'| of Fig. 2;

Fig. 8 is a detail vertical sectional view on the line 8-8 of Fig. i;

Fig. 9 is a detail sectional view on the line 9-9 of Fig. 8;

Fig. 10 is a detail sectional view looking from the right side of themachine toward the left showing the upper saw pulley, the view being onthe lines III-ll of Figs. 9 and 12;

Fig. 11 is a detail perspective view of the upper saw, pulley showingthe pulley mounting and some associated parts:

Fig. 12 is a detail sectional view on the lines 12-42 of Figs. 1, 8 and10;

Fig. 13 is a detail perspective view showing some of the adjustable sawguide means;

Fig. 14 is a detail sectional view through the slidable table, the viewbeing taken on the lines H-H of Figs. 1 and 2; I

Fig. 15 is a detail plan section on the line l5li of Fig. 14;

Fig. 16 is a detail sectional view on the line IC-l of Fig. 15; and

was

' ing base I, which may be made of sheet metal or it may be a casting.The body of the base has a relatively square top, there being provided adownwardly inclined; forwardly extending part 2. The base also has aflat top 3 upon which there is secured firmly and rigidly a main framestructure 4. The main frame 4 is preferably made of sheet metal,properly configurated, and rests on the base I, being secured to thebase by means of bolts passing through angulated flanges 5 on the mainframe and resting on top of the flat top surface 3 of the base I.

The main frame 4 includes a front wall 6, with in-turned side sections Iand 3, which form parts of the side walls 9 and I3, respectively. A rearwall section II includes a bent or turned section l2 which is spacedfrom the section or part 3 and forms part of the left side wall In. Thesections 1 and 8 are turned from the front wall 5, and the section I2 onthe rear wall II, and are provided with in-turned integral flanges tostrengthen the frame and add rigidity thereto.

A top plate I3 has interfitting relationship with the front wall 8, therear wall II, and the section parts or posts 3 and I2 which form theleft end or side wall It, being secured rigidly to those parts such asby welding, Figs. 1, 3 and 5.

The top plate I 3 has an integral downwardly extending center plate l4,Figs. 2 and 3, which is welded or otherwise fastened to the front wall Iand to the rear wall ll, there being side flanges on the center platefor that purpose. The center plate strengthens the main frame, addsrigidity thereto, and provides a support for some of the operatingmechanism of the machine.

A vertically extending support l5, Fig. 5, in the form of a U-shapedmember or a channel member, is welded to one side of the center plate,and this support has an opening therein which corresponds with a similaropening in the center plate N to receive a tubular bearing It in whichthere is revolubly mounted a drive shaft l1.

A driven pulley l3, Fig. 5, is fixed to the drive shaft l1, and thispulley is driven by V-belts I9, I9 from a motor pulley 20 on theshaft'of an electric motor 2i, Fig. 3. The motor 2| has its basepivotally connected to the base I of the machine and is adjustablysupported by a screw member 22 which is pivoted to a part of the frameand which acts as a belt tightener. The pulleys l3 and 20 and theV-belts i9 are arranged on one side of the center plate l4, while alower driven saw pulley 23 is mounted on the other side of the centerplate l4, Figs. 2 and 5. the saw pulley 23 being removably supported anddriven by the drive shaft II which protrudes the necessary distancebeyond the face of the center plate l4 to make a proper drivingconnection. The drive shaft I1 is splined to co-operate with splines onthe pulley 23 so as to drive properly the pulle 23. The extreme outerend of the drive shaft I1 is threaded to receive threadedly a hand wheel24, Figs. 2 and 5, so as to mount removably the driven pulley 23 on thesplines of the drive shaft H.

A plate 25, Fig. 3, is arranged above-the motor and is secured rigidly,by welding or otherwise, to the center plate l4 and to the front andrear walls 5 and II, respectively, Figs. 3 and 5. The plate 25 has awater-tight connection with the '4 said walls and plate so that anywater, scraps or debris which may accumulate in the compartment formedby the enclosing walls and plates will be prevented from getting intothe lower compartment where the motor and electrical connections arehoused,

A sheet metal structure 25 is mounted upon and secured to the main framestructure 4 and includes a flanged plate 21, the under surface of whichrests upon the upper surface of the top plate i3. An angularly shapedplate 28 is integral with the Plate and extends downwardly from theplate 21 and is adapted to bear against and be secured to the inner faceof the center plate l4, Figs. 2 and 5. The super-structure is secured tothe main frame structure by fastening the plates 21 and 28 to the platesl3 and I4 in any convenient manner, such as by bolting these partstogether. Flanges on the plate 28 have interfitting relationship withcertain parts of the main frame, while a flange on an edge of the plate28 is secured fixedly to th rear wall H. The construction and relationof the parts is such as to make a rigid, non-rockin machine which willnot shift or loosen during operation and which will reduce vibration toa minimum. The top of the plate I3 is provided with adjusting screws 29,Fig. 5, which engage the underside of the plate 21 so as to level thesuperstructure before the super-structure is bolted to the main fram 4.The super-structure 26 also includes an upstanding hollow column or post30 which is welded to the top of the plate 21,

Figs. 3 and 5. The column 30 is integral with a hollow inwardlyextending head part or head housing-3| which houses and supports certainoperating and adjusting mechanism required for the machine, Figs. '1, 2,8, and 10. 4

An adjusting fixture 32, Figs. 8 and 9, for pcsitioning the upper 'sawpulley 33 for the band saw 34, and for tensioning the band saw 34, isadjustable vertically in the head 3| of the superstructur 26. Thefixture 32 includes an inverted U-shaped member or yoke 35 having acentral threaded bore 36,'Fig. 8, to engage a threaded stem'31 extendingthrough the casing .-of the head and carried by an adjusting hand wheel33 arranged outside of the head, Figs; 8 and 9., A channel-shapedbridge. 33 of the adlusting member or fixture 32 is located below theyoke 35 and has its upper surface facing the under sides of the legs ofthe yoke, Fig. 8. Bolts 43 pass through the top of the bridge 39 andthrough the legs of the yoke 35 and threadedly engage nuts 4| secured toor held by the legs of the yoke. Springs 42 are interposed between theheads 43 of the bolts 40 and the underside of the bridge 39 and holdresiliently the bridge 39 to the yoke 35, Figs.8and 9.

An indicator 44, Figs. 8 and 9, is carried by the fixture 32, and thisindicator includes a vertical rod 45, and a vertically disposed tubularmember 45 through which the rod 45 extends. The rod 45 threadedlyengages an integral extension on the bridge 39, being held in adjustedposition by a lock nut 41, Fig. 8. The tubular member 45 is rigidlysecured to a rigid extension 43 at the top of the inverted U-shaped yoke35 and is adapted to extend through an opening in the head housingand'be visible from the outside. as clearly shown in Fig. 8. The rod 45and tubular member 43 therefore are movable with the vertical movementof the adjusting fixture 32, but the rod 45 has slidable movement withrespect to the tube 43 when tension is applied to the springs 32. Thefixture 32 is guided vertically in the longitudinal opening in one side01 the head by means 03 side guide flanges 33 on the head part 3|, Fig.8, and a flanged U-shaped strap 33 secured to the bridge 33, Figs. 9, i0and 12.

A channel-shaped member 3| is arranged between the 'legs of the U-shapedyoke 35 and has its legs straddling the bridge 33, being pivotaliyconnected to the bridge by means of an adjustin; belt or screw 32, Fig.8. The member SI and the bridge 33 have alined openings to receive a lugor plug 33 on the turned flange 33, Figs. 8 and 12, of a bearingsupporting bracket 53, Figs. 9,

11 and 12. The bearing supporting bracket 53 is therefore hung andsupported by the member 31 on the bridge 39 of the adjustable fixture32. The bearing supporting bracket 35, Figs. 8 and 3, carries a bearing58, Figs. 8, 9, and 11, for the shaft of the upper saw pulley 33.

The bearing 56, Fig. 11, is arranged in the opening below the bridge 33,Figs. 8 and 9, and

is arranged for vertical adjustabl movement by operation of the handwheel 38 so as to position properly the upper saw pulley 33 and totension properly the band saw 34. The lower end of the bracket 53, Fig.11, is provided with turned lugs 31, 31 through which a guide bolt 53passes, the bolt 33 being between the guide flanges 49, Fig. 8, andhaving a nut 33 so as to provide the proper length to flt between theguide flanges 49 whereby vertical adjustable movement of the upper sawpulley 33 may be had, but side play or movement of the bracket 55 isaverted. The upper" saw pulley 33 and the saw 34 are arranged on oneside of a wall of the head part 3i of the super-structure, while theadjustable fixture 32 is arranged on the opposite side of said wall andwithin the housing of the head part, Figs. 8 and 12. A door 33 arrangedin a side wall of the head 3i permits access to the adjusting fixture.

The upper saw pulley 33 has its axis directly above the axis oi. thelower flxed rotary saw pulley 23, Fig. 2, the band saw 33 being trainedover said pulleys 23 and 33. Vertical adjustment of the upper saw pulley33, and tensioning of the band saw 33, are accomplished by manuallyoperating the hand wheel 33 which controls the position of theadjustable flxture 32.

The handwheel 33 is rotated in a counterclockwise direction to lower theadjustable flxture 32, whereupon the distance between the saw pulleys 33and 23 is decreased, thereby permittingv an endless bandsaw to beapplied or removed easily and quickly over the corresponding saw pulleys23' and 33. Rotation of the hand wheel 33 in a clockwise directionraises the adjustable flxture '32 and lengthens the distance between thecenters of the saw pulleys 23 and 33 to position properly the pulley 33and tension the saw 34. Raising the adjustable fixture 32, by rotationof the hand wheel 33 in a clockwise direction, causes the rod 45 and thetubular member 33 to raise with it, placing a tension on the saw 33because the yoke is held by the hand wheel shaft 31 while the bracket55, which supports the upper saw pulley 33, is carried by the bridge 33;and inasmuch as the bridge 33 is resiliently carried by the yoke 33,through the springs 42, there will be a separation between the yoke 33and the bridge 33 as the springs 42 are being compressed. The separationof the parts 33 and 33 by the compression of the springs 32 is reflectedby the relative position of the top 03 the rod 33 with rupect to theupper end of the tubular member 33. The change of position of the upperends of the members 33 and 33 occurs only when tensioning ing thesprings 42 because the rod II is connected to the bridge 33, while themember 33 is carried by the yoke 33. The proper amount rangement oi therod 43 and the tube 43 whichare carried by the respective parts,connected resiliently through the springs 42, comprises the indicatingmeans 44 to indicate proper saw tensioning. The adjustable fixture 32permits relative movement of the saw puileycenters so that a new saw canbe applied easily, as well as permitting the use of a saw of somewhatgreater length than necessary; The longer saw permits repairs to be madeshould breakage occur, as each repair necessarily may cause sawshortening.

The saw moves very rapidly during use, and should the saw break whiletraveling at high speed there may be danger of the upper saw pulleybecoming dislodged. Also, the rapid rotative movement of the pulley 33may cause the saw to be whipped about should it break. It is desirable,therefore, that the upper saw pulley be stopped as soon aspossibleshould the saw break. Means are therefore provided to take care of suchan emergency, and these means comprise spring steel flngers 3|, Figs. 9and 11,

flxed to a face of the bracket 53. These fingers I engage a wall of thehead housing and tend to tilt the upper saw pulley 33 out of its normalvertical plane when there is no saw trained over the saw pulleys 23 and33. A saw trained over the pulleys 23 and 33 and tensioned properlycompresses the spring fingers 3i and maintains the pulleys in the propervertical plane. However, should the saw break during use, there will beno tension on the upper saw pulley 33 and the fingers will tilt theupper pulley 33, causing the upper edge of the pulley 33 to pressagainst a strip of brake material 62, Fig. 9, mounted on the headhousingadjacent the upper periphery of the upper saw pulley 33. Sawbreakage, therefore, causes the spring fingers ii to come into play,tilt the pulley 33 out of vertical, and bring the pulley 33 into contactwith the brake material 32 to stop instantly the rotation of the pulley33.

The super-structure 23 has a hollow shelllike cover 33, Figs. 2 and 9,which is hinged at 33 to the column 33 and to the head housing 3i andcovers one side of the head housing 3| and the column or post 3|. Thiscover 33, Fig. 2, conceals and covers the upper saw pulley 33 and onereach of the saw 33, the saw running between a face of the post 33 andthe elongated part 35 of the cover 33, Figs. 2 and 8.

A casing or reflector 33, having an open bottom, Figs. 8 and 9, iscarried at the bottom of the head housing 3|, and this casing carries alamp 81 fltted into a socket member 63 which is pivoted at 69 to thereflector or casing 63, Fig. 8. Electrical conductors arranged in'cabiel0, and leading to a source of electric supply, are electricallydownwardly at the bared or operating part of the ishadbyeomps'esssaw,and the pivotal mounting of the lamp socket it "permits a lamp to beinserted or removed easily and quickly, Figs. 8 and 9.

The bared or cutting portion of the saw 2| is indicated by the letter Ain Figs. 1, 8, and 13, the saw being guarded by an-adjustable guardmember II which extends downwardly through the bottom of the headhousing 2|, Figs. 1, 8, l0, and 13. The saw guard member 1| comprises abar 12. Fig. 13, which is slidably positioned between two members 13,ll, mg. 8, which are urged frictionally against the bar 12 by springmembers It. The bar 12 has longitudinal limited slidable movement intoand out of the head casing SI so as to cover andguard such part of thesaw not required for the actual sawing operation. The spring pressedmembers I2, I2 permit the bar to be retained by friction at any positionwithin the limits of its movement. The lower end of the bar 12, Fig. 13,has fastened thereto a bifurcated member 15 which pivotally supports abacking member It having a split flnger ll-acting respectively as abacking and guide for the saw 34 so as to prevent bowing or buckling ofthe saw during operation. A rigid extension 18 on the bar 12 haspivotally connected thereto at 19 a sheet metal guard II to cover suchopen part A of the saw 24 as not in actual use. The pivotal mounting ofthe guard permits the guard to swing out of the way, and away from thesaw, if desired. A finger piece II, Figs. 8 and 2, may be attached tothe bar 12 for raising or lowering the same, and, if desired, the bar 12may be locked in raised or lowered position by a set or clamping screwat, Fig. 8, which engages the bar I2. A hand wheel 83 may be employedfor operating the locking set screw 22, Fig. 8.

Combined saw scrapers and backer ll, 84, Fig. 2, may be mounted on thecenter plate II to wipe off bone dust or other particles from the saw'and provide backings for the saw to prevent buckling or bowing of thesaw during use.

A movable or slidable table support 2!, Figs.

members or bumpers 52, Fig. 14. The races 88 and I! of the support 25are rigidly secured, such as by welding or otherwise, to longitudinalstiffening channels as, Fig. 17, which are secured to the front face asof the table support II. Angular members in the form of struts 28 arebent from' the face 25 and a table supporting surface or face in isrigidly secured, as by welding, to the front face 95 and the struts I.The surface 01 includes a front tie bar 22 in the form of a channelwhich is fixed to the side struts or members 36, Fi 17.

The support is is slidable freely on the bearings of the bearingsupports 28 and is prevented against vertical or lateral movement. Theslidable movement of the table support I! is limited by offset bumpersI, Fig. 14, which are fixed to the front wall 0 of the main frame 4andengage'flanges III on the ends of the lower race way 21, Figs. 1, 14,and 17.

of the angular struts 96, Fig. 1. A locking mem-- ber I04. Fig. 4', ishinged at I05 to the underside Y of the table top IM and clips over alegI" of the front tie member 98.

A removable pusher I01, Figs. 1 and 4, for leg operation to shift thetable 85, IIII, is provided with a resilient flange I08, Fig. 4, spacedfrom the body I09 to provide a groove into which the front flange no ofthe table top extends. The 1 front of the pusher is rounded out toreceive the upper part or thigh of the operator's leg so that theoperator, by standing against the table and leaning from one side to theother, may slide the table easily to and fro. An end flange III. F 82.

1, 2, and 3, extends upwardly from one side of the table top so as tosupport the meat being out. A fiber end 2, Figs. 1 and 2, is provided atthe edge of the flange so that no injury can come to the saw as thetable is moved.

A compartment II3, Figs. 2 and 5, is located immediately above a part ofthe compartment" which houses the motor. The compartment IIl houses thelower saw pulley 23 and includes a bottom II which is welded along thefront wall 6, the section I which forms part of the right side wall 9,and the section I2 of the rear wall II, Fig. 2. The bottom plate H4 iswater-tight and, therefore, the compartment H3 may be easily cleaned bywashing with hot water by use of a' hose. The part of the compartmentnot covered by the section I of the side wall 9 and the section I2 ofthe rearwall II, is closed by a corner section II5, Fig. 2.

The corner section Iii, Figs. 2, 5, and 6, includes a section or partIIS which, with the section l2, completes the rear II, and anothersectlon or part Ill which, with the section 1, completes the right sidewall 9. Iii is pivoted, by means of hinges I I8, to a flange II! formedon the section I2 of the rear wall II, Figs. 5 and 6. A flange I20 bentfrom the section [I6 provides a shieldadjacent the saw and parallels thecenter plate It, thereby forming a shield for the saw to catch bone dustas well as providing a stiffener for the corner section. The cornersection H5 also includes a top plate I2I, Figs. 1, la, and 2, havingside flanges I22, Fig. 3, extending over the sections IIS and II! whichform parts of the rear wall II and side wall 2, respectively. The topplate I2I has its normal upper or working surface flush with the top ofthe slide table top IIII on the slide table support 25. One edge I23,Fig. 1a, of the top plate I2I is depressed downwardly at I24 to providea de-' .pressed ledge I25 which fits under the slide table top IIII,Fig. 3, whereupon the tables IOI and HI will be flush when the cornersection Ill is locked into closed normal operating position.

The corner section H5 is locked in closed posi-' tion by means of adetractible locking stop I22, Fig. 7, on a part of the main frame 4engaging under a down-turned flange I21 on the depressed ledge I25. Ahandle I28, Figs. 2 and 7, is provided to retract the locking lug orstop I26 so 16 Fig. 1a, to accommodate the band saw 24; The

The corner section notch I ll is filled by a removable ilber plug I32which is slit at I33 to permit the passage of the saw 34. This plug I32,Fig. 1b, is removably arranged in the channel socket I3I under the tabletop I2I and acts as a backing for the saw and prevents bowing of the sawat the bared or operating part A thereof. Graduations I34 and I35,indicative of known measurements, extend from the slit I33 so that theoperator may know the thickness of a cut to be sawed from the substance,Figs. 1a and 15.

A gauge plate I36, Figs. 1, 2, and 5, is adapted table top. The end ofthe plug I51 provides a for slidable forward and rearward movement overthe top face of the table I2I so that the operator may gauge thethickness of the substance to be sawed, Figs. 2 and 5. This gauge plateI36 has a faceplate I31, a bottom flange I38, and a side flange I39being bent from the face plate, Fig. 5. An inclined reinforcing plateI40, including an end flange, is secured to the back of the face plateand to the bottom and side flanges I38 and I39, respectively, Fig.5.

An extension on the side flange I36 is connected to a fitting I4I Fig.5, which is adapted for longitudinal movement along a rod I42. The rodI42 is pivoted between the ears I43 of a bracket I44, Fig. 2, which isfastened at the upper rear wall on the section I I6 of the corner memberI I5. The gauge plate I36 is therefore pivotally mounted so that it maybe swung out of the way when not in use, as shown in Fig. 2. The pivotalmovement is accomplished by the connection of the gauge plate to the rodI42 which has pivotal movement in the ears I43 of the bracket I44. Theoutward pivotal movement may be limited byan angle clip on the fittingI4I engaging the underside of the bracket body I44. The lower edge ofthe rod I42 is provided with spaced rack teeth I45, Fig. 5, with whichthe teeth of a pinion I46-have cooperative engagement. The pinion isrevolubly mounted inside of the fitting I, but the pinion shaft I41extends through the fitting for manual operation by an external handwheel I48, Fig. 5. The gauge plate I36 may be moved manually by pullingor pushing the same along the rod I42, or it may be moved by rotatingthe hand wheel I48. The gauge plate I36 first may be slid by hand andthen a flnal or micrometer adjustment may be had by turning the handwheel I48. The top of the rod I42 has "a flat surface I49, Fig. 5, withwhich a set screw I50 co-operates to lock the gauge plate in adjustedposition, a handle I5I being fixed to the set screw I 50 to operate thesame.

The compartment below the corner member II5. Fig. 5, may be closed by aremovable corner member I52, this member I52 being provided with louvresI63 to provide ventilation for the motor compartment.

A removable table top I54, Fig. 1, is flush with the table tops III andI2I, the top I54 having a tongue for interfltting engagement with thetop I2I. A depressed channel-shaped integral side extension on the top I54 extends beneath the forward edge of the table Ill and abuts againstthe forward edge of the slide table support 65, Figs. 1 and 3.. A flangeI55 is turned up for convenience to preventsubstance from falling on thetop I54,

1 while a down-turned flange extends from a side to strengthen the top I54 and add rigidity thereto as well as to eliminate sharp edges, Fig. 1.The edge I56, Figs. 1 and 5, of the top I 54 abuts the edge of the tabletop I II, there being a removable metal plug I51 slidably arranged in acut-away I56 in the top I54. The plug I51 is slidable in backing for thesaw, there being a slit I 59 cooperating with the slit I33 toaccommodate a reach of the saw. The table I54 may be locked in positionby a screw I60, Figs. 5 and 8, on the underside of the table, havinglocking engagement with a flange I6I fastened near the top of the sidewall 8. A flange I62, Fig. 3, about the post 30, and beneath which theupper side of the table I54 extends, tends to position the table I54 andhold the table in position.

A switch box I63, Figs. 3 and 5, is arranged in the lower compartmentwhere the motor is located and to which the electric motor 2I iselectrically connected, there being electric conductors, leading from asource of supply, electrically connected to the switch box. The boxcontains an electric switch for making and breaking con,- tact betweenthe conductors and the motor. The same switch is electrically connectedto the conductors 18 for the lamp 61 so that when the switch is in oneposition the motor will be running and the lamp 61 will be lit, but whenthe switch is operated to break contact there will be no electric energyto the motor or the lamp. Therefore, when'the motor 2I is running thelamp will be lit but when the motor is stopped the lamp will e out.

The switch in the box It: is operated by afoot pedal or treadle I64,Fig. 3, which extends over and is fastened to a shaft I65 to which alink I66 is also fastened. The shaft I65 is rocked by the pedal I64 andthe rocking movement of the shaft is transmitted to the link I66. Thelink I56 is pivoted at I61 to a vertically movable rod I68 which isadapted to operate the switch to "on or off positions in any convenientconventional manner. The pedal I64, when pressed at its upper end, willoperate the link I66 and rod I66 to opcrate the switch to start themotor and light the lamp, but when the treadle is depressed at its loweror forward end, the switch will be operated to shut off the motor andthe light.

A hand operated meat pusher I69, Fig. 2, having ribs I10 on its frontface may be provided to push the substance towards the gauge plate,particularly when the piece of substance is relatively small, Fig. 2.This pusher has a side opening which fits over the flange I I I on theslidable table top I III being slidable manually forwardly andrearwardly over the top of the table III, the forward slidable movementof the pusher being limited by the fiber block I I I2. The pusher may beremoved by sliding it toward the operator (to the left, Fig. 2),whereupon it may be slipped oif the flange III.

The side wall 8, Fig. 1, has an opening therein to get into thecompartment where the motor, switch, and other parts are arranged. Thisopening may be closed by a removable panel "I which is provided withlouvres I12 for ventilating the motor compartment.

The invention provides a sturdy, rigidly constructed meat, bone and fishsaw which is rela-- tively light in weight but which is sturdy andrelatively vibrationless during operation. The saw comprises variousparts which are adapted to have interfitting relationship and stillprovide smooth, unobstructed working surfaces, but capable of easyremoval for cleaning purposes and otherwise. The construction andarrangement of the saw are such that certain parts of the machine whichare likely to have bone dust, grease and other material come in contacttherewith, may be readily and easily cleaned because of the water-tightconnection separating such parts from other operating parts of themachine. The saw is provided with lighting means so as to direct a beamof light at the concentrated point of operation, there being novel meansfor controlling the operation of the light and the motor, as well asmeans for effecting the proper tensioning of the blade over the pulleys,with indicating means in co-operation therewith to indicate the propersaw tensioning.

Changes may be made in the form, construction and arrangement of theparts without de-' fairly fall within the scope of the following claims.

The invention is hereby claimed as follows:

1. A meat and bone saw comprising a lower frame structure havingenclosing walls, an upper superstructure mounted on the lower framestructure, an upper saw pulley rotatively mounted in the superstructure,a cooperating lower saw pulley rotatively mounted in the lower framestructure. an endless saw trained over said pulleys, means for mountingpivotally the upper saw pulley, means shifting the upper saw pulley atan angle from the vertical when the saw is not tensioned suflicientlyover said pulleys, and means for arresting the rotation of the last saidpulley when the latter is moved out of the vertical.

2. A meat and bone saw comprising a lower frame structure havingenclosing walls, an upper superstructure mounted on the lower framestructure, an upper saw pulley rotatively mounted in the superstructure,a cooperating lower saw pulley rotatively mounted in the lower framestructure, an endless saw trained over said pulleys, means for mountingpivotally the upper saw pulley, means shifting the upper saw pulley atan angle from the vertical when the saw is not tensioned suillcientlyover said pulleys, and brake means arranged for engagement with theupper pulley when the upper pulley is inclined to the vertical.

3. In combination, a pair of spaced pulleys, an endless element passingover said pulleys, means mounting one of said pulleys for adjustment intwo diiferent directions. means for effecting movement of the last saidpulley in one direction to control the tension of said endless element,means operating automatically to move the pulley in another directionwhen the said element is not under proper tension, and means forarresting the rotation of the last said pulley when it is shifted by thesaid automatic means.

4. A meat and bone saw machine embodying a cutter element, a tablesupport in proximity to the cutter element secured to a wall of themachine, opposed spaced upper and lower ball races in the support, atable mounted on the support, opposed upper and lower ball races at oneend of the table and respectively cooperating with said first races, theball races on said support being disposed between the ball races on saidtable, ball bearing means in said respective cooperating races, andmeans on the support to retain said ball bearing means. I

ARTHUR H. AHRNDT.

JOHN G. KRENZKE. HENDRIX STUKART.

REFERENCES crren UNITED STATES PATENTS Number Name Date Re. 17,475Campbell Oct. 29, 1929 1,384,742 Clark July 19. 1921 1,427,661 WalkerAug. 29, 1922 1,443,789 Humphreys Jan. 30, 1923 1,793,461 Biro Feb. 24,1931 1,803,489 Scheuren May 5, 1931 1,841,939 De Koning Jan. 19, 19321,927,203 De Groot Sept. 19, 1933 2,037,283 Strachan Apr, 14, 19382,081,033 Biro May 18, 1937 2,143,242 Hartman Jan. 10, 1939 2,169,517Biro Aug. 15, 1939 2,205,527 Hartman June 25, 1940 2,280,621 Biro Apr.21, 1942 2,294,560 Bennett Sept. 1, 1942 2,311,268 Tannewitz Feb. 16,1943 2,311,762 Kottmann et a1. Feb. 23, 1943 2,380,700 Lasar July 31,1945 FOREIGN PATENTS Number Country Date 265,889 Great Britain Feb. 17,1927 23,789 Netherlands July 15, 1931

